Part Type: Engine Cooling Fan Clutch. Notes: Reverse Rotation; Severe Duty Thermal Fan Clutch;. Reverse Rotation Severe Duty Thermal Fan Clutch. Fan Clutch, Thermal. Fan Clutch. 2007 Chevrolet Silverado 3500 Classic Engine: 8.1L V8; Reverse Rotation; Severe Duty Thermal Fan Clutch;.